SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dede7607a1858846a191cfc693c5a9d22c9a1cb0a9111c4fe4524912efb96681' 
  AND token = 'DOppz6ZjokXOB/h3PpeicTu5LlPLg+wrGFR0y5MHiCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}